JP5577150B2 - Housing, reducer, and motor with reducer - Google Patents

Description

  The present invention relates to a housing for a speed reducer, for example, a housing for a motor with a speed reducer used for driving a power window of a vehicle.

  2. Description of the Related Art Conventionally, as a mechanism for driving a power window of an automobile, a motor including a reduction gear including a worm and a worm wheel is known. As such a motor, a motor including a breather for discharging air expanded inside the gear case due to heat generated during operation is known (see Patent Document 1).

JP-A-7-322547

  By the way, in a motor equipped with such a breather (ventilation opening), when the gear case is warmed and the water is bathed, the air in the gear case contracts, and the pressure difference between the inside and outside of the gear case causes the air to pass through the breather. There is a possibility of water intrusion. In particular, when a water film is stretched on the opening of the breather, water is easily sucked into the gear case.

  This invention is made | formed in view of such a condition, The place made into the objective is to provide the technique which suppresses that water penetrate | invades through the vent hole inside the housing | casing of a reduction gear.

  In order to solve the above problems, a housing according to an aspect of the present invention is a housing of a reduction gear used for a motor, and is molded integrally with a housing portion that houses parts of the speed reducer, A vent for communicating between the inside and the outside of the housing. The vent has a notch formed at the edge of the opening on the outside.

  According to this aspect, it is difficult for the water film to stick to the opening of the vent. Further, even if a water film is stretched at the opening of the vent, a notch is less likely to cause a pressure difference between the inside and the outside of the housing.

  The opening may have an end surface that is formed obliquely with respect to the ventilation direction of the vent. This makes it difficult for a water film to stick to the opening of the vent.

  You may further provide the attaching part which attaches a housing | casing to the predetermined position of a vehicle. The vent hole may be provided at a position where the opening portion faces downward in a state where the housing is attached to the vehicle via the attachment portion. Thereby, it is suppressed that water penetrate | invades into the inside from the exterior of a housing | casing via a vent hole.

  The notch may be formed so as to be positioned above the center of the opening in a state where the housing is attached to the vehicle via the attachment. Thereby, it becomes difficult to cover a notch with a water film.

  The opening may be provided such that the rotational axis of the worm wheel housed in the housing intersects the surface including the end surface. For example, when a housing that accommodates a worm wheel is attached to the inside of a vehicle door, the attachment position has a certain degree of freedom within a range in which the opening of the vent hole faces downward about the rotation axis of the worm wheel. Therefore, by providing the opening so that the rotation axis of the worm wheel and the surface including the end face intersect, the notch is easily positioned above the center of the opening.

  You may further provide the connection part to which a connector is connected. The connection portion may be provided at a position where the connection direction of the connector is 60 ° or less with respect to the ventilation direction of the vent hole. Thereby, the freedom degree of the attachment angle at the time of attaching to the door of a vehicle etc. improves.

  The width of the cutout may be 1 mm or more and 1/2 or less of the inner diameter of the opening. Thereby, it becomes more difficult to stretch the water film.

  Another aspect of the present invention is a speed reducer. This reduction device includes a worm to which the rotation of the motor is transmitted, a worm wheel that meshes with the worm and transmits the rotation to the output shaft, and a housing that houses the worm wheel.

  According to this aspect, it is possible to provide a speed reducer that is less affected by water on the worm, worm wheel, and the like.

  Yet another embodiment of the present invention is a motor with a reduction gear. The motor with a speed reducer includes a motor and a speed reducer connected to the motor shaft.

  According to this aspect, it is possible to provide a motor with a reduction gear that has little influence on the motor by water.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that water penetrate | invades through the vent hole inside the housing | casing of a reduction gear.

It is a front view of the DC motor with a reduction gear according to the first embodiment. It is sectional drawing which shows an example of the inside of the housing | casing of the DC motor with a reduction gear. It is a front view which shows the external appearance of a breather. FIG. 4 is a side view of the breather shown in FIG. 3. It is the figure which showed typically the state which attached the DC motor with a reduction gear which concerns on 1st Embodiment to the door panel. It is the figure which showed typically the state which attached the DC motor with a reduction gear to the door panel in the direction rotated 90 degrees from the state of FIG. It is a front view of the DC motor with a reduction gear according to the second embodiment. It is a side view of the DC motor with a reduction gear shown in FIG. It is the perspective view which expanded the breather vicinity of the DC motor with a reduction gear shown in FIG. It is the figure which showed typically the state which attached the DC motor with a reduction gear which concerns on 2nd Embodiment to the door panel. It is the figure which showed typically the state which attached the DC motor with a reduction gear to the door panel in the direction rotated 90 degrees from the state of FIG. It is the figure which showed typically the state which attached the DC motor with a reduction gear to the door panel in the direction rotated 180 degrees from the state of FIG. It is a perspective view of a DC motor with a reduction gear according to a third embodiment. It is the side view which showed typically the state which attached the DC motor with a reduction gear which concerns on 3rd Embodiment to the door panel. FIG. 15A is a schematic view showing a state in which the motor is attached to the door panel or via the regulator so that the breather ventilation direction A is −45 ° from the vertically lower side. FIG. 15B is a schematic diagram showing a state in which the motor is attached to the door panel or via the regulator so that the breather ventilation direction A is vertically downward. FIG. 15C is a schematic diagram showing a state in which the motor is attached to the door panel or via the regulator so that the breather ventilation direction A is 45 ° from below in the vertical direction.

  The speed reducer including the housing according to the present invention is applicable to a device that moves an object by decelerating the movement of a motor, and is suitable for a device such as a vehicle power window system or a door closure, for example. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, the structure described below is an illustration and does not limit the scope of the present invention at all.

(First embodiment)
FIG. 1 is a front view of a DC motor 100 with a speed reducer according to the first embodiment. The DC motor 100 with a speed reducer includes a motor unit 10 and a speed reducer 12 connected to the shaft of the motor unit 10. The motor unit 10 includes a connector 14 for supplying power from the outside. The speed reducer 12 includes a cylindrical casing 16 that houses a worm wheel described later.

  FIG. 2 is a cross-sectional view showing an example of the inside of the casing of the DC motor with a reduction gear. As shown in FIG. 2, the housing 16 has a gear case main body 18 and a cover 20. The cover 20 has a circular opening formed in the center, and the output shaft 22 and a fixed shaft 24 that rotatably supports the output shaft 22 protrude from the opening toward the outside of the housing 16. . As shown in FIG. 2, the fixed shaft 24 is fixed to the gear case body 18.

  The gear case body 18 functions as a housing portion that houses the worm 28 and the worm wheel 30 that are fixed to the shaft 26 of the motor unit 10. The worm 28 and the worm wheel 30 are both parts that constitute a reduction gear. Further, the gear case main body 18 includes a breather 32 (see FIG. 1) that communicates the inside and the outside of the gear case main body 18 and a mounting portion 33 (see FIG. 1) for attaching the DC motor 100 with a speed reducer to a vehicle door panel. Is provided by integral molding. The breather 32 discharges or inhales such air pressure when a pressure difference occurs between the inside and outside of the housing due to temperature changes caused by heat generation inside the housing 16 or cooling of the housing. Serves as a vent to eliminate the difference.

  The rotation of the motor unit 10 is transmitted to the worm 28 via the shaft 26. The worm wheel 30 is configured to mesh with the worm 28 and transmits rotation to the output shaft 22. The worm wheel 30 is rotatably supported by a fixed shaft 24 fixed to the gear case body 18.

  FIG. 3 is a front view showing the appearance of the breather 32. The breather 32 is a semi-cylindrical portion provided on the outer wall of the gear case body 18 by integral molding. The breather 32 has a notch 36 formed at the edge 34 a of the opening 34 on the outside of the gear case body 18. As described above, the casing 16 according to the present embodiment is less likely to have a water film on the opening 34 of the breather 32. In addition, even if a water film is stretched in the opening 34 of the breather 32, air can be sucked and exhausted through the notch 36, so that a pressure difference occurs between the inside and the outside of the housing 16. It becomes difficult. Therefore, foreign matter such as water existing outside the housing 16 due to the pressure difference is suppressed from being sucked into the housing 16.

  The width T of the notch 36 is preferably a size and a shape that allow water to hardly enter from the notch 36 and facilitate ventilation through the notch 36. As a result of intensive studies by the inventor, it was found that the width T is more preferably 1 mm or more and 1/2 or less of the inner diameter D of the opening 34. By setting the width T of the notch 36 in this way, the water film is more difficult to stretch.

  FIG. 4 is a side view of the breather 32 shown in FIG. In FIG. 4, a case where the ventilation direction A is directed vertically downward will be described. As shown in FIG. 4, the opening 34 has an end surface 38 that is formed obliquely with respect to the ventilation direction A of the breather 32. This makes it difficult for the water film to stick to the opening 34 of the breather 32.

  The reason for this is that, as shown in FIG. 4, if the water film 40 is stretched in the opening, the thickness of the water film 40 is not uniform, and the water film 40 close to the notch 36 located at the upper portion of the end surface 38. The thickness is reduced. Therefore, even if the water film 40 once adheres to the end surface 38, the water film 40 is easily broken from a thin portion near the notch 36, so that the water film 40 is less likely to continue to cover the opening 34. It is done.

  Therefore, the notch 36 is preferably formed so as to be positioned above the center of the opening 34 in a state where the housing 16 is attached to the vehicle via the attachment 33. Thereby, it becomes difficult to cover a notch with a water film.

  The casing 16 of the DC motor 100 with a reduction gear according to the present embodiment is sealed between the gear case body 18 and the cover 20 with an O-ring or the like so that water does not enter from the gap. . However, water may enter the inside of the housing 16 through the breather 32 and the connector 14 described above. Therefore, the direction in which the DC motor 100 with a speed reducer is attached to the door panel is important.

  FIG. 5 is a diagram schematically showing a state in which the DC motor 100 with a speed reducer according to the first embodiment is attached to a door panel. FIG. 6 is a view schematically showing a state where the DC motor 100 with a speed reducer is attached to the door panel in a direction rotated 90 ° from the state of FIG. 5. In the door panel 42 to which the DC motor 100 with a speed reducer is attached via the attachment portion 33, water may enter downward from a gap with the door glass 44. Even in such a case, the DC with a speed reducer is used so that the opening 34 of the breather 32 and the connection port 46 of the connector 14 do not face upward so that water does not enter the inside of the housing via the breather 32 or the connector 14. The motor 100 is preferably attached to the door panel 42.

  In the DC motor 100 with a reduction gear according to the first embodiment, the angle formed by the ventilation direction A of the breather 32 and the attachment / detachment direction B of the connector 14 is approximately 90 °. Therefore, as shown in FIG. 5, the breather 32 is provided at a position facing downward when the casing 16 is attached to the vehicle via the attachment portion 33. Accordingly, water can be prevented from entering the inside of the housing 16 from the outside through the breather 32. Moreover, since the connection port 46 of the connector 14 also faces in the horizontal direction and does not face in the upward direction, water can be prevented from entering from the outside to the inside of the housing 16 via the connector 14.

  In addition, the attachment position of DC motor 100 with a reduction gear is not restricted to the case of FIG. 5, You may attach as shown in FIG. In the state shown in FIG. 6, the DC motor 100 with a speed reducer has the ventilation direction A of the breather 32 in the horizontal direction and the detaching direction B of the connector 14 in the vertically downward direction. If the DC motor 100 with a speed reducer is in such an attachment position, water can be prevented from entering from the outside to the inside of the housing 16 via the breather 32 and the connector 14. Thus, when the DC motor 100 with a speed reducer according to the first embodiment is attached to the door panel 42, the attachment position can be selected within a range of about 90 ° around the rotation axis of the worm wheel 30.

(Second Embodiment)
The DC motor with a speed reducer according to the second embodiment is mainly characterized in that the arrangement of the breather is different from that of the first embodiment. FIG. 7 is a front view of a DC motor with a reduction gear according to the second embodiment. FIG. 8 is a side view of the DC motor with a reduction gear shown in FIG. FIG. 9 is an enlarged perspective view of the vicinity of the breather of the DC motor with a reduction gear shown in FIG. Note that in the second embodiment, the same members and elements as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG. 7, the DC motor 200 with a speed reducer according to the second embodiment is provided with a breather 132 in a part of the housing 116, and the ventilation direction A of the breather 132 is the attachment / detachment direction of the connector 14. It is parallel to B. Further, as shown in FIGS. 8 and 9, the breather 132 has a notch 36 formed in the edge 34 a of the opening 34 on the outside of the gear case main body 118. Therefore, the breather 132 in the DC motor 200 with a speed reducer is unlikely to have a water film on the opening 34, like the breather 32 according to the first embodiment. As a result, the situation where water enters the inside of the housing 116 through the breather 132 is suppressed.

  Next, the direction in which the DC motor 200 with a speed reducer is attached to the inside of the door panel of the vehicle will be described. FIG. 10 is a diagram schematically illustrating a state in which the DC motor 200 with a speed reducer according to the second embodiment is attached to the door panel. FIG. 11 is a diagram schematically showing a state where the DC motor 200 with a speed reducer is attached to the door panel in a direction rotated by 90 ° from the state of FIG. 10. FIG. 12 is a diagram schematically showing a state where the DC motor 200 with a speed reducer is attached to the door panel in a direction rotated by 180 ° from the state of FIG. 10.

  In the DC motor 200 with a reduction gear according to the second embodiment, the angle formed by the ventilation direction A of the breather 132 and the attachment / detachment direction B of the connector 14 is approximately 0 °. Therefore, as shown in FIG. 10, the breather 132 and the connector 14 are provided at positions that face the horizontal direction in a state where the casing 116 is attached to the vehicle via the attachment portion 33. Therefore, water can be prevented from entering the inside of the housing 116 from the inside through the breather 132. In particular, since the end surface 38 of the breather 132 is directed downward, the water falling from the door glass 44 side does not easily enter the breather 132 directly. Moreover, since the connection port 46 of the connector 14 also faces in the horizontal direction and does not face in the upward direction, water can be prevented from entering from the outside to the inside of the housing 16 via the connector 14.

  Further, in the state shown in FIG. 11, in the DC motor 200 with a speed reducer, both the opening 34 of the breather 132 and the connection port 46 of the connector 14 face vertically downward. Therefore, even when the breather 132 or the connector 14 is exposed to water, water can be reliably prevented from entering the housing 116 from the opening 34 or the connection port 46.

  Further, in the DC motor 200 with a speed reducer, even in the state shown in FIG. 12, the opening 34 of the breather 132 and the connection port 46 of the connector 14 both face the horizontal direction and do not face upward. Therefore, water can be prevented from entering the inside of the housing 116 from the inside through the breather 132. Moreover, since the connection port 46 of the connector 14 also faces in the horizontal direction and does not face in the upward direction, water can be prevented from entering from the outside to the inside of the housing 16 via the connector 14. As described above, when the DC motor 200 with a speed reducer according to the second embodiment is attached to the door panel 42, the attachment position can be selected within a range of about 180 ° around the rotation axis of the worm wheel 30. The internal space can be used efficiently.

  Therefore, the connection port 46 is preferably provided at a position where the connection direction B of the connector 14 is 60 ° or less with respect to the ventilation direction A of the breather 132. More preferably, the connection direction B and the ventilation direction A are the same as described above. Thereby, the freedom degree of the attachment angle at the time of attaching DC motor 200 with a reduction gear to the door of a vehicle, etc. improves.

(Third embodiment)
In the breather 132 of the DC motor 200 with a reduction gear according to the second embodiment, the opening 34 is provided so that the rotation shaft of the worm wheel housed in the housing 116 and the surface including the end surface 38 do not intersect. It has been. For this reason, depending on the direction in which the DC motor 200 with a speed reducer is attached to the door panel 42, the end surface 38 may face upward even though the ventilation direction A of the breather 132 is downward. Therefore, the breather according to the present embodiment is provided so that the rotation axis of the worm wheel housed in the housing intersects the surface including the end surface.

  FIG. 13 is a perspective view of a DC motor 300 with a speed reducer according to the third embodiment. FIG. 14 is a side view schematically showing a state in which the DC motor 300 with a reduction gear according to the third embodiment is attached to the door panel 42. The DC motor 300 with a speed reducer is substantially the same as the DC motor 200 with a speed reducer according to the second embodiment except for the breather.

  As shown in FIG. 13, the breather 232 is a semi-cylindrical portion provided on the outer wall of the gear case body 118 by integral molding. The breather 232 has a notch 236 formed at the edge 234 a of the opening 234 on the outside of the gear case main body 118. When the speed reducer-equipped DC motor 300 provided with such a breather 232 is attached to the door panel 42 in the direction shown in FIG. 14, it is difficult for a water film to stick to the opening 234 of the breather 232. Further, even if a water film is stretched in the opening 234 of the breather 232, air can be sucked and exhausted through the notch 236, so that a pressure difference occurs between the inside and the outside of the housing 116. It becomes difficult. Therefore, foreign matter such as water existing outside the housing 116 due to the pressure difference is prevented from being sucked into the housing 116.

  As shown in FIG. 14, the end of the breather 232 has an end face 238 that is inclined with respect to the ventilation direction A. Here, the angle θ formed by the ventilation direction A and the end face 238 may be appropriately selected. For example, if θ is reduced, it becomes difficult to form a water film in the opening, but the end face 238 is often directed upward depending on the mounting direction. On the other hand, when θ approaches 90 °, it becomes easier to form a water film in the opening, but the end face is less likely to face upward depending on the mounting direction.

  Next, the difference in the orientation of the breather 232 depending on the mounting position of the DC motor 300 with a reduction gear according to the third embodiment will be described. FIG. 15A is a schematic diagram showing a state where the motor is attached to the door panel or via the regulator so that the breathing direction A of the breather 232 is −45 ° from the vertically lower side. FIG. 15B is a schematic view showing a state where the motor is attached to the door panel or via the regulator so that the ventilation direction A of the breather 232 is vertically downward. FIG. 15C is a schematic diagram showing a state where the motor is attached to the door panel or via the regulator so that the breathing direction A of the breather 232 is 45 ° from below vertically.

  In the DC motor 300 with a speed reducer according to the present embodiment, when the casing 116 that accommodates the worm wheel is mounted inside the door panel 42 of the vehicle, the mounting position is an opening of the breather 232 around the rotation axis of the worm wheel. There is a certain degree of freedom in the range in which is downward. In the DC motor 300 with a reduction gear according to the present embodiment, the breather 232 is provided so that the rotational axis C of the worm wheel and the surface including the end surface 238 intersect with each other, so the notch 236 is the center of the opening 234. It becomes easier to be positioned above. Therefore, the notch 236 is hardly covered with the water film.

  Further, even if the mounting position is changed with respect to the door panel 42 around the rotation axis of the worm wheel 30, the end face 238 does not face upward unless the opening 234 itself of the breather 232 is directed upward. Therefore, in the second embodiment, unlike the breather 132 shown in FIG. 12, the state where the end surface 38 faces upward is not generated even though the ventilation direction A is the horizontal direction. In other words, the notch 236 is not positioned below the center of the opening 234, and the notch 236 is not easily covered with the water film.

  Since each breather according to each of the above-described embodiments is formed integrally with the housing, the breather has higher strength and is deformed or damaged by an external force compared to the case where the breather is configured as a separate part. It is difficult to do. Further, when water is taken from the side opposite to the side where the breather is provided, the casing does not serve as a shield and the water is not directly applied to the breather.

  Moreover, since the speed reducer according to each of the above-described embodiments includes the above-described casing, the influence of water on the worm, the worm wheel, and the like is small.

  Moreover, since the motor with a reduction gear according to each of the above-described embodiments includes the above-described reduction gear, the influence of water on the motor is small.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Further, it is possible to appropriately change the combination and processing order in each embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to each embodiment. Embodiments to which is added can also be included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 Motor part, 12 Reducer, 14 Connector, 16 Housing, 18 Gear case main body, 20 Cover, 28 Worm, 30 Worm wheel, 32 Breather, 33 Mounting part, 34 Opening part, 34a Edge, 38 End face, 40 Water film, 42 Door panel, 46 connection port, 100 DC motor with reduction gear.

Claims (8)

A reduction gear housing used for a motor,
An accommodating portion for accommodating a reduction gear component;
A vent that is molded integrally with the housing and communicates the interior and exterior of the housing;
With
The vent has a notch formed at the edge of the opening on the outside side ,
The opening has an end surface formed obliquely with respect to the ventilation direction of the vent,
The casing is characterized in that the notch is formed at an upper end of the end face . A mounting portion for attaching the housing to a predetermined position of the vehicle;
The vents housing according to claim 1, wherein, wherein the opening in a state where the housing is attached to the vehicle by the attachment portion is provided in a position facing downwards. The casing according to claim 2 , wherein the notch is formed so as to be positioned above a center of the opening in a state where the casing is attached to the vehicle via the attachment portion. . The casing according to claim 3 , wherein the opening is provided so that a rotation axis of a worm wheel accommodated in the casing and a plane including the end face intersect each other. A connecting portion to which the connector is connected;
The case according to any one of claims 1 to 4 , wherein the connection portion is provided at a position where a connection direction of the connector is 60 ° or less with respect to a ventilation direction of the vent hole. . The casing according to any one of claims 1 to 5 , wherein a width of the notch is 1 mm or more and ½ or less of an inner diameter of the opening. A worm that transmits the rotation of the motor;
A worm wheel that meshes with the worm and transmits rotation to the output shaft;
The housing according to any one of claims 1 to 6 , which accommodates the worm wheel;
A speed reducer comprising: A motor,
The speed reducer according to claim 7 connected to a shaft of the motor;
A motor with a speed reducer.

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